That is an erroneous statement as it stands. But it depends upon how normal is defined. It's normal from a biological point of view for pubertal mammals to have sex. Other points of view (religious, parental, etc.) may disagree.
Absolutely correct. There is no "normal." It's an illusion. The freest, most prosperous, productive civilzations in most of our history have been ones that declared a Judeo-Christian ethic. The most barbaric and cruel societies, where innocents including children are sacrificed, where females are supressed to sub-human status, where slavery either by law or by socialism, is okay -- not a one of them declares the Judeo Christian ethic.
Our Judeo-Christian foundation is the key that we turn and open the door to our lives, progress, pursuit, and freedom. When we allow its tenets to be rejected, we suffer the consequences and it should come as no surprise. It isn't as if there haven't been plenty of examples over the centuries.
Great point - this needs to be expounded upon and shoved in the faces of all the "multicultural" crowd.